What causes the O2 sensor circuit low voltage code?

This code occurs when the engine control module (ECM) sees the voltage of the O2 sensor for bank 1 sensor 2 below .21 volts when the ECM has commanded the fuel to a targeted rich condition on that bank of the engine. What causes the P0137 code? The ECM detects the low voltage problem and turns on the Check Engine Light.

What is the voltage of the oxygen sensor?

The oxygen sensor immediately reports the change so that the less fuel the PCM injects into the engine, the smaller the voltage that the O2 sensor’s voltage produces. Its voltage can go as low as 0.050 to 0.100 Volts. This is considered a Lean Condition.

How does the PCM affect the oxygen sensor?

As soon as the PCM sees the Rich Condition it’s causing (according to the oxygen sensor’s feedback), the PCM injects less fuel. The oxygen sensor immediately reports the change so that the less fuel the PCM injects into the engine, the smaller the voltage that the O2 sensor’s voltage produces. Its voltage can go as low as 0.050 to 0.100 Volts.

Where is the O2 oxygen sensor in the engine?

Also, The (O2) Oxygen Sensor is not able to measure the air or the fuel entering the engine. Because, the (O2) Oxygen Sensor is located in the exhaust and that where it reads the actual oxygen content in the exhaust. Depending on the year; make and model of your vehicle you could have anywhere from one to four (O2) Oxygen Sensors.

What should the voltage be on the O2 sensor?

The sensor voltage should cycle or fluctuate within the 100 mV-900 mV (0.10 to 0.90V) range. Hence, This means the sensor is operating properly. If the (O2) sensor only produces a low or high voltage signal. So, either you have an engine performance issue or the (O2) sensor stopped working.

What does it mean when O2 sensor stops working?

Hence, This means the sensor is operating properly. If the (O2) sensor only produces a low or high voltage signal. So, either you have an engine performance issue or the (O2) sensor stopped working. Finally, To verify sensor operation, conduct the next two tests.

As soon as the PCM sees the Rich Condition it’s causing (according to the oxygen sensor’s feedback), the PCM injects less fuel. The oxygen sensor immediately reports the change so that the less fuel the PCM injects into the engine, the smaller the voltage that the O2 sensor’s voltage produces. Its voltage can go as low as 0.050 to 0.100 Volts.

What does code low mean on oxygen sensor?

Unfortunately, this is a pretty common code that stands for oxygen sensor voltage low. Often people want to try replacing the sensor, but this is just one reason the code sets in the electronic control module. I would say only about 50 percent of the time, replacing the part solves the problem.